UI中心跟随鼠标移动

//脚本挂在需要跟随鼠标移动的UI上

using UnityEngine;
using System.Collections;
using UnityEngine.UI;
using UnityEngine.EventSystems;

public class CharacterControl : MonoBehaviour
{
　　public Camera UICamera;
　　Vector3 scenePos;
　　void Start () 
　　{
　　　　EventTriggerListener.Get(gameObject).onDrag = OnMouseDrag;
　　}
　　void OnMouseDrag(GameObject img)
　　{
　　　　Vector2 mous = Input.mousePosition;

　　　　scenePos = new Vector3(mous.x, mous.y, UICamera.WorldToScreenPoint(transform.position).z);
　　　　transform.position = UICamera.ScreenToWorldPoint(scenePos);
　　}
}